/**
 * FileName: Gps
 * Author:   Leopold
 * Date:     2018/9/27 9:43
 * Description:
 * History:
 */
package cn.mcsys.myadmin.common.utils;

public class GpsUtils {

    public static double pi = 3.1415926535897932384626;
    public static double a = 6378245.0;
    public static double ee = 0.00669342162296594323;

    private double mgLon;

    private double mgLat;

    public GpsUtils(double mgLon, double mgLat) {
        this.mgLon = mgLon;
        this.mgLat = mgLat;
    }

    /**
     * 地球坐标系 (WGS84) 与火星坐标系 (GCJ-02) 的转换算法 将 WGS84 坐标转换成 GCJ-02 坐标
     */
    public static GpsUtils gps84_To_Gcj02(double lat, double lon) {
        if (outOfChina(lat, lon)) {
            return null;
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new GpsUtils(mgLon, mgLat);
    }


    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347) return true;
        if (lat < 0.8293 || lat > 55.8271) return true;
        return false;
    }
    private static GpsUtils transform(double lat, double lon) {
        if (outOfChina(lat, lon)) return new GpsUtils(lat, lon);
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new GpsUtils(mgLon, mgLat);
    }
    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
                + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }
    private static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
                * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

    public double getMgLon() {
        return mgLon;
    }

    public void setMgLon(double mgLon) {
        this.mgLon = mgLon;
    }

    public double getMgLat() {
        return mgLat;
    }

    public void setMgLat(double mgLat) {
        this.mgLat = mgLat;
    }
}
